Plumbing Questions? Ask a Plumber and Get Answers ASAP.
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What model Munchkin do you have?
Give me a few minutes to pull the specs for your boiler
What controls the DHW zone? a zone valve? does it have it's own circulator/pump?
So you have a pump for DHW. What do you have for a relay to control the pumps?
Well I suspect this may be a relay not a boiler issue. I can't help you if you can't tell me what you have for equipment. Your best bet may be to call in a pro
I've worked on more of these systems than I can count. I'm completely blind here and if you can't provide the info I need I can't help you. With no errors showing your problem is probably not boiler related.